/*
 * Copyright 1999-2022 Alibaba Group Holding Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.nacos.plugin.datasource.impl.oracle;

import com.alibaba.nacos.plugin.datasource.constants.DataSourceConstant;
import com.alibaba.nacos.plugin.datasource.constants.FieldConstant;
import com.alibaba.nacos.plugin.datasource.mapper.GroupCapacityMapper;
import com.alibaba.nacos.plugin.datasource.model.MapperContext;
import com.alibaba.nacos.plugin.datasource.model.MapperResult;

import java.util.ArrayList;
import java.util.List;

/**
 * The derby implementation of {@link GroupCapacityMapper}.
 *
 * @author lixiaoshuang
 */
public class GroupCapacityMapperByOracle extends AbstractMapperByOracle implements GroupCapacityMapper {

    @Override
    public String getDataSource() {
        return DataSourceConstant.ORACLE;
    }

    @Override
    public MapperResult selectGroupInfoBySize(MapperContext context) {
        Object id = context.getWhereParameter(FieldConstant.ID);
        Integer pageSize = context.getPageSize();

        String sql = "SELECT * FROM ( "
                + "SELECT id, group_id, ROWNUM rn FROM ( "
                + "SELECT id, group_id FROM group_capacity WHERE id > ? ORDER BY id "
                + ") WHERE ROWNUM <= ? "
                + ") WHERE rn > 0";

        List<Object> params = new ArrayList<>();
        params.add(id);
        params.add(pageSize);
        return new MapperResult(sql, params);
    }
}

